Rock tumbler



FIG. 1 is a front, right, and top perspective view of a rock tumbler, showing my design.

FIG. 2 is a rear, left, and bottom perspective view thereof.

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a right side elevation view thereof.

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines shown in the drawings are included for the purpose of illustrating portions of the rock tumbler that form no part of the claimed design. 

CLAIM The ornamental design for a rock tumbler, as shown and described. 